This talk provides a concise overview of Radio Frequency Identification (RFID) technology and its vulnerabilities, focusing on the Chameleon Ultra, a powerful RFID emulation tool. Through a detailed explanation and live demonstration, we will explore how attackers can clone and write to RFID cards used in access control, simulating real-world security threats. Attendees will gain insights into RFID’s weaknesses and the critical need to protect emerging technologies from unauthorised exploitation.